package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.entity.User;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 删除购物车的一个商品
     *
     * @param shoppingCartDTO
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list != null && list.size() > 0) {
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if (number == 1) {
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            } else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }

        }
    }


    /**
     * 添加购物车
     * @param shoppingCartDTO
     * @return
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        //查询当前登录用户购物车中是否有改商品
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //已经存在了
        if (list != null && list.size() >0){
           ShoppingCart cart = list.get(0);
           cart.setNumber(cart.getNumber() + 1);//update
           shoppingCartMapper.updateNumberById(cart);
        }else {
            //不存在
            //判断添加的是 套餐还是商品
            Long dishId = shoppingCartDTO.getDishId();

            if (dishId != null){
                //本次添加到购物车的是菜品
                //查询 菜品的 价格 名称图片路径
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                //添加进来的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();

                Setmeal setmeal = setmealMapper.getMealById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            //同一插入
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            //插入数据
            shoppingCartMapper.insert(shoppingCart);

        }


    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //获取当前微信用的id
        Long userId = BaseContext.getCurrentId();
        //ShoppingCart cart = new ShoppingCart();
        //cart.setUserId(userId);
        ShoppingCart shoppingCart = ShoppingCart.builder()
                     .userId(userId)
                     .build();

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     * @return
     */
    public void claenShoppingCart() {

        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }
}